Corner Filter Bio Foam Sponge For Fish Tank Aquarium Breeding Space Saving Foams (Extra Large)

High quality aquarium corner sponge filters in a choice of 4 sizes. The corner design saves space in the aquarium as the filter can go right in the corner of the aquarium. Aerobic bacteria colonise the sponge providing a bacterial surface to facilitate the nitrogen cycle. In addition, the sponge traps larger waste particles and mechanically cleans the water without trapping baby fish. The small corner sponge filter measures 8cm x 12cm x 5.5cm (LxWxT). It is suitable for aquariums up to 7.5 gallons. They are useful as a breeding filter or as a secondary filter in the aquarium.